mirror image for president obama. every time he gets a question, he's going to try to focus on mitt romney's plans, governor romney's plans for the future and say, listen, we may not be in the best shape right now, but it's going to be even worse if we implement his plans. >> so, each of them will be pivoting? >> reporter: each time. but here's the thing. and both sides don't really know what's going to happen tonight, because, as david pointed out, this format is so loose. once they get into the discussion, almost anything can happen. they could directly challenge each other. jim lehrer could come in, the moderator, directly challenge them. but they really don't know. >> we'll right here with you along the abc news to react and fact check one on one the debate coming up at 6:00 p.m. pacific time, 9:00 p.m. eastern. we have two developing stories from overseas. tonight the city of aleppo t commercial equivalent of they new york city. four car bombs killed nearly 40 people. eyewitnesses described what felt like series